[R-meta] Accounting for baseline differences in meta-analysis

Dr. Gerta Rücker ruecker @end|ng |rom |mb|@un|-|re|burg@de
Thu Jan 28 12:35:05 CET 2021

Dear Gladys,

An obvious approach would be to take the post values (or, equivalently, 
the change scores) as an outcome, and the baseline values as a covariate 
in a metaregression model.



Am 28.01.2021 um 10:49 schrieb Gladys Barragan-Jason:
> Dear all,
> I would like to know how to take the baseline difference into account 
> in meta-analysis of the impact of a treatment on experimental data in 
> which the baseline of the control group is different from the baseline 
> of the treatment.
> For now, I am using the post- means and SD of the control and the 
> treatment group (and the rma.mv <http://rma.mv> function) and also the 
> pre-post values of the treatment group but I don't think this is 
> correct and I am not sure how to proceed.
> Any advice?
> Thanks a lot in advance.
> Best regards,
> Gladys
> -- 
> ------------------------------------------
> Gladys Barragan-Jason, PhD.  Website 
> <https://sites.google.com/view/gladysbarraganjason/home>
> Station d'Ecologie Théorique et Expérimentale (SETE)
> CNRS de Moulis
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